NEW DELHI: The postmortem report on the death of Delhi Police constable Subhash Tomar, who died while on duty during the protest at India Gate against the gang-rape of the 23-year-old girl in a moving bus, says that he died of heart attack triggered by injuries.

Talking to reporters, a spokeman for the Delhi Police on Wednesday quoting from the postmortem said, "Tomar died of myocardial infarction (heart attack) which was precipitated by multiple injuries caused by blunt object(s)."

There had been widespread speculation on the real cause of Tomar's death with the government insisting that he was hit by the protesters, while protesters who were present on the spot and tried to help him said that he collapsed on his own.

Earlier, a journalism student Yogendra, who claimed to be a witness, said constable Subhash Tomar fell down on his own, contradicting police version that he was beaten up by protesters leading to his death.

"I was at India Gate with a female friend who was injured. I saw one policeman who was running after protesters and then suddenly collapsing. We rushed towards him and some policemen were also there. Suddenly, the policemen started running after other protesters.

"So I rushed to a nearby PCR van. They took him to hospital. I also went in the same vehicle. I saw him in hospital and his body didn't have any injuries. He wasn't trampled by a mob, he wasn't assaulted. The claims of police are false. I am surprised to hear that 8 were arrested over Subhash Tomar's death," he claimed.

Doctors at Ram Manohar Lohia Hospital said the constable had no major external injury marks when he was brought to the hospital and that he had suffered a heart attack.

"He came in a state of total collapse and our doctors revived him and as he was not stable, we shifted him to the Intensive Care Unit. He was on ventilator," Dr TS Sidhu, medical superintendent of Ram Manohar Lohia Hospital said.

He said there was no "major external injury marks except for some cuts and bruises".

Asked whether is it was a case of cardiac arrest, the doctor evaded a direct reply.

"I don't know. That is not my comment. He came, he was in serious shock and we revived him. In all our records, there are no severe internal injuries recorded but the post-mortem will tell everything," he said.

Arvind Kejriwal-led Aam Aadmi Party demanded sacking of Delhi police commissioner alleging that the police were misleading people by arresting eight "innocent youth" in connection with the incident.

Reacting to Yogendra's claims, Kejriwal said his account was opposite of what police said. "Is police lying?" he asked.